depends on the postal system you are using and the service you are availing. In some countries with unreliable postal services, such as Colombia, locals...

telephony is primarily used where no other service is available. Prices and price structure vary between systems. Satellite phones may be illegal or not...

National Park System incorporates hundreds of units spread across every state in the union as well as several U.S. territories. National Park System units are...

constructed new systems only in the 21st century; many of these newer systems operate on only a single route with very limited service outside the weekday...

Electrical systems around the world differ in voltage and, less critically, frequency. Plugs and sockets also vary and it might be physically impossible...

rating systems purport to evaluate restaurants, hotels and travel accommodation in individual countries or worldwide. The value of these systems, much...

The Alaska Marine Highway (AMH) or the Alaska Marine Highway System (AMHS) are a network of ferry lines connecting destinations along the southern coast...

primarily by the US Forest Service; see National Scenic Area This article doesn't contain all the natural areas in the National Park System. See also United States...

Trails System Act. It is administered by the US Forest Service. The Forest Service partners with the Bureau of Land Management, National Park Service, California...

unlocks it with the card and drives away. The system operates unattended; the short-term self-service rental is billed to a charge card, along with any...

metric system, officially known as the International System of Units (French: Système International, or SI). Before the introduction of the metric system, there...

Not to be confused with the United States National Park System, which also operates National Monuments, historic sites, etc. There are 63 national parks...

rail transportation systems which are an attraction in their own right, See urban rail adventures. Public transportation is a system of scheduled passenger...

travel in Sweden for intercity services. Stockholm County (Swedish: Stockholms län) has an extensive public transportation system. It includes the Stockholm...

Area of Colorado. Englewood is a full-service city with its own, independent park, library, and public works systems, but little to draw visitors. As part...

transportation system is the Dubai Tram, which opened on November 12, 2014. It provides commuters with a comfortable transit service around the prime...

yearly subscription. Many railways offering high-speed service have returned to a three class system that was abolished in Europe in the 1950s with the withdrawal...

Bay Area are connected by a network of local and regional transit systems. All systems listed in this guide, even those that are shuttles, are open to the...

military and scientific usage, the United States does not use the metric system, instead retaining its own customary units. This means that road distances...

The Normans imposed the system of Feudalism on England, and the bulk of the population were made to work the land in service of their Norman lords. In...